You could also use the male lead of most romance harems such as Shingo Uryū: Mashiroiro SymphonyKazuma Hoshino: Hoshizora E Kakaru HashiYuuri Mito: Tayutama: Kiss On My DeityPretty much anything that was originally a visual novel. They all will have the kind and gentle demeanor that Mr. Rogers has

Also Craft Lawrence from Spice and Wolf could work well, he is older than all the others and looks more like Mr.Rogers.